Analysis of an off road 4WD vehicle’s suspension system modification – Case study of aftermarket suspension lift and modification of wheel track size

2016 ◽  
Author(s):  
J. Ross ◽  
M. A. Hazrat ◽  
M. G. Rasul
Keyword(s):  
Suspension System ◽  
Wheel Track

scholarly journals Effect of Rail Vehicle–Track Coupled Dynamics on Fatigue Failure of Coil Spring in a Suspension System

2021 ◽  
Vol 11 (6) ◽  
pp. 2650
Author(s):  
Sunil Kumar Sharma ◽  
Rakesh Chandmal Sharma ◽  
Jaesun Lee
Keyword(s):  
Mathematical Model ◽  
Fatigue Fracture ◽  
Suspension System ◽  
Railway Vehicle ◽  
Coil Spring ◽  
Internal Resonances ◽  
Rail Vehicle ◽  
Rail Vehicles ◽  
Stress Result ◽  
Wheel Track

In a rail vehicle, fatigue fracture causes a significant number of failures in the coil spring of the suspension system. In this work, the origin of these failures is examined by studying the rail wheel–track interaction, the modal analysis of the coil springs and the stresses induced during operation. The spring is tested experimentally, and a mathematical model is developed to show its force vs. displacement characteristics. A vertical 10-degree-of-freedom (DOF) mathematical model of a full-scale railway vehicle is developed, showing the motions of the car body, bogies and wheelsets, which are then combined with a track. The springs show internal resonances at nearly 50–60 Hz, where significant stresses are induced in them. From the stress result, the weakest position in the innerspring is identified and a few guidelines are proposed for the reduction of vibration and stress in rail vehicles.

A Fuzzy Nonlinear Modeling of a McPherson Suspension System

2005 ◽  
Author(s):  
Ali Tavassoli ◽  
Hamed Jafarian ◽  
Mohammad Eghtesad
Keyword(s):  
Dynamical Systems ◽  
Initial Conditions ◽  
Nonlinear Modeling ◽  
Fuzzy Model ◽  
Domain Of Attraction ◽  
Suspension System ◽  
Reliable Model ◽  
Sugeno Model ◽  
Takagi Sugeno

The Takagi-Sugeno fuzzy model (TSfm) is a universal approximation of continuous real functions that are defined in a closed and bounded subset of Rn. This strong property of the TSfm can find several applications in modeling of dynamical systems that are described by differential equations. In this paper, we consider Takagi-Sugeno fuzzy model for a McPherson suspension system. One advantage of TSfm is its wide domain of attraction in compare with the other methods. To apply TSf modeling, one must precisely choose the nonlinear terms of the system governing equations. For each nonlinear term, there should be selected some linear subsystems that together represent the equivalent of the original nonlinear suspension system. This equivalence, for our case study, is illustrated by simulation results for various road disturbances and initial conditions which show the Takagi-Sugeno model can give a realistic and reliable model for dynamical systems.

Vehicle Handling Dynamics Optimization Based in Passive Suspension Settings in Target Cascading Framework

2014 ◽  
Author(s):  
Juan C. Blanco ◽  
Luis E. Muñoz
Keyword(s):  
Optimal Design ◽  
Optimization Problem ◽  
Suspension System ◽  
Dynamics Simulation ◽  
Design Stage ◽  
Partial Geometry ◽  
Embodiment Design ◽  
Design Variables ◽  
Target Cascading

The vehicle optimal design is a multi-objective multi-domain optimization problem. Each design aspect must be analyzed by taking into account the interactions present with other design aspects. Given the size and complexity of the problem, the application of global optimization methodologies is not suitable; hierarchical problem decomposition is beneficial for the problem analysis. This paper studies the handling dynamics optimization problem as a sub-problem of the vehicle optimal design. This sub-problem is an important part of the overall vehicle design decomposition. It is proposed that the embodiment design stage can be performed in an optimal viewpoint with the application of the analytical target cascading (ATC) optimization strategy. It is also proposed that the design variables should have sufficient physical significance, but also give the overall design enough design degrees of freedom. In this way, other optimization sub-problems can be managed with a reduced variable redundancy and sub-problem couplings. Given that the ATC strategy is an objective-driven methodology, it is proposed that the objectives of the handling dynamics, which is a sub-problem in the general ATC problem, can be defined from a Pareto optimal set at a higher optimization level. This optimal generation of objectives would lead to an optimal solution as seen at the upper-level hierarchy. The use of a lumped mass handling dynamics model is proposed in order to manage an efficient optimization process based in handling dynamics simulations. This model contains detailed information of the tire properties modeled by the Pacejka tire model, as well as linear characteristics of the suspension system. The performance of this model is verified with a complete multi-body simulation program such as ADAMS/car. The handling optimization problem is presented including the proposed design variables, the handling dynamics simulation model and a case study in which a double wishbone suspension system of an off-road vehicle is analyzed. In the case study, the handling optimization problem is solved by taking into account couplings with the suspension kinematics optimization problem. The solution of this coupled problem leads to the partial geometry definition of the suspension system mechanism.

Can minor compaction increase soil carbon sequestration? A case study in a soil under a wheel-track in an orchard

Geoderma ◽  
2012 ◽  
Vol 183-184 ◽  
pp. 74-79 ◽  
Author(s):  
M. Deurer ◽  
K. Müller ◽  
I. Kim ◽  
K.Y. Huh ◽  
I. Young ◽  
...  
Keyword(s):  
Carbon Sequestration ◽  
Soil Carbon ◽  
Soil Carbon Sequestration ◽  
Wheel Track

Dynamics of off-Road Tracked Vehicles Equipped with Trailing Arm Suspension

1995 ◽  
Vol 209 (3) ◽  
pp. 195-215 ◽  
Author(s):  
A Dhir ◽  
S Sankar
Keyword(s):  
Simulation Model ◽  
Suspension System ◽  
Design Tool ◽  
Dynamic Responses ◽  
Lagrangian Model ◽  
Ride Quality ◽  
Vehicle Suspension ◽  
Computer Simulation Model ◽  
Tracked Vehicles ◽  
Wheel Track

A two-dimensional computer simulation model is developed for dynamic analysis of high-mobility tracked vehicles fitted with a trailing arm suspension system. The simulation model is oriented as a design tool for detailed analysis of vehicle suspension dynamics and ride quality assessment. The Lagrangian model formulation of a tracked vehicle is derived by considering a rigid terrain of an arbitrary profile and constant forward vehicle speed. The model incorporates detailed representations of a vehicle suspension system and dynamic wheel-track-terrain interactions. The wheel forces are evaluated based on an adaptive footprint formulation of a wheel/track-terrain contact patch, and the track forces are modelled based on kinematic considerations. The computer model predictions are validated against field measurements, which were gathered from an extensive field testing of an in-service armoured personnel carrier. The comparison between measured and simulated dynamic responses exhibits a fairly close correlation.

Modeling and Simulation of MacPherson Suspension Based on LMS Virtual.Lab Motion

2014 ◽  
Vol 494-495 ◽  
pp. 24-27
Author(s):  
Wei Dong Wang ◽  
Tian Yi Yan
Keyword(s):  
Modeling And Simulation ◽  
Inclination Angle ◽  
Suspension System ◽  
Front Suspension ◽  
Kinematics Simulation ◽  
Design Requirements ◽  
Wheel Track

A model of the Macpherson front suspension system assembly was built by using LMS Virtual.Lab Motion. The kinematics simulation for the Macpherson suspension was carried out under the simulation of parallel wheel travel. The result shows that the angles of toe, camber, castor all comply with the design requirements, but kingpin inclination angle and wheel track have a little big, it is necessary to further optimization and improvement.

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